<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>
        div p{
            background-color: aqua;
        }

        p b{
            background-color: blue;
        }
    </style>
</head>
<body>
    <div>
        <p>111</p>
    </div>    
    <p>222</p>
    <p>
        <b>333</b>
    </p>

</body>
</html>